Doing some research for Madhu. I've been posting here at interact for over 8 years. I'm sure you'll agree that's a lot in internet time. Here's the link to my first month. Kinda' quaint.
And I began posting long before that over at MetaFilter, where I really got in on the ground floor. I lurked for a little while, then grabbed user number 252, and first commented on thread 572, January 27th, 2000.
Yes, interact is languishing a little right now. I've been spending more time on Facebook. But I am proud of this weblog, not least of all because it's one of the things I've done longest in my life.